A novel light-emitting device is provided. A light-emitting device with high emission efficiency is provided. A light-emitting device with a long lifetime is provided. A light-emitting device with low driving voltage is provided. The light-emitting device includes an anode, a cathode, and an EL layer between the anode and the cathode. The EL layer includes a hole-injection layer, a light-emitting layer, and an electron-transport layer. The hole-injection layer is positioned between the anode and the light-emitting layer. The electron-transport layer is positioned between the light-emitting layer and the cathode. The hole-injection layer contains a first substance and a second substance. The first substance is an organic compound which has a hole-transport property and a HOMO level higher than or equal to −5.7 eV and lower than or equal to −5.4 eV. The second substance exhibits an electron-accepting property with respect to the first substance. The electron-transport layer contains a material whose resistance decreases with current flowing therethrough.

An embodiment of the present disclosure provides an organic light emitting device, including an anode, a cathode, a light emitting layer arranged between the anode and the cathode, and an electron block layer arranged on a side of the light emitting layer facing the anode, the light emitting layer including a host material and a dopant material, the host material including an N-type material and a P-type material, and a material of the electron block layer and the N-type material satisfying: 2.75 eV≤|LUMO.sub.N-host−HOMO.sub.EBL|<3.05 eV; 0.3< HOMO.sub.N-host−HOMO.sub.EBL|≤1 eV, and |HOMO.sub.EBL|<|HOMO.sub.N-host|, a difference between a peak wavelength of a luminescence spectrum curve of an exciplex formed by the material of the electron block layer and the N-type material and an absorption band edge wavelength of an absorption spectrum curve of the dopant material being Δλ, Δλ>30 nm.

According to principals as disclosed herein an organic, light emitting diode assembly is provided having a first electrode. An electron injection layer is adjacent to the first electrode. A first electron transport layer composed of inorganic material is adjacent to the electron injection layer. A second electron transport layer composed of organic material is adjacent to the first electron transport layer and in contact with an organic light emitting material layer. The organic light emitting material layer is in direct, abutting contact with the second electron transport layer. A hole transport layer is adjacent to the organic light emitting material layer and a second electrode is adjacent to the hole transport layer.

A reliable light-emitting element with low driving voltage is provided. The light-emitting element includes an electron-injection layer between a cathode and a light-emitting layer. The electron-injection layer is a mixed film of a transition metal and an organic compound having an unshared electron pair. An atom of the transition metal and the organic compound form SOMO.

A light-emitting device and an electronic apparatus including the same are provided. The light-emitting device includes an emission layer that includes a first emission layer and a second emission layer.

According to one embodiment, a display device includes an anode, an organic EL element layer including a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a hole blocking layer, an electron transport layer and an electron injection layer, and a cathode, wherein ΔE2_LUMO is defined as a potential barrier between the electron transport layer and the hole blocking layer, and the light-emitting layer, ΔE2_HOMO is defined as a potential barrier between the hole transport layer and the electron blocking layer, and the light-emitting layer, and each of ΔE2_LUMO and ΔE2_HOMO is 0.1 eV or higher and 0.5 eV or less.

A quantum dot device and an electronic device. The quantum dot device includes a first electrode and an opposite facing second electrode, a light emitting layer disposed between the first electrode and the second electrode and including quantum dots, a first electron auxiliary layer proximate to the light emitting layer and disposed between the second electrode and the light emitting layer and including a first electron auxiliary material, a second electron auxiliary layer proximate to the second electrode and disposed between the second electrode and the light emitting layer and including a second electron auxiliary material, and an insertion layer disposed between the first electron auxiliary layer and the second electron auxiliary layer and including an inorganic material, wherein a HOMO energy level of the inorganic material is deeper than a HOMO energy level of the first electron auxiliary material, and a HOMO energy level of the second electron auxiliary material, respectively.

An organic light emitting diode includes an anode, an emission layer disposed on the anode and including a host, a phosphorescent dopant represented by Chemical Formula 1 and a fluorescent dopant represented by Chemical Formula 2, and a cathode disposed on the emission layer formed by mixing the fluorescent dopant with the phosphorescent dopant including an acceptor at a specific site, thereby energy loss during an emission process can be minimized and energy transfer efficiency can be improved and an organic light emitting diode with excellent luminous efficiency and an organic light emitting display device having the same can be achieved.

An organic light emitting diode includes a first emitting part including a first emitting material layer (EML) and a first electron transporting layer (ETL), a second emitting part including a second EML and between the first emitting part and the second electrode, an n-type charge generation layer (CGL) contacting the first ETL and between the first ETL and the second emitting part, and a p-type CGL contacting the n-type CGL and between the n-type CGL and the second emitting part. The first ETL includes a first compound, and the n-type CGL includes a second compound and an n-type dopant. A lowest unoccupied molecular orbital (LUMO) energy level of the first compound can be higher than a LUMO energy level of the second compound.

An organic light emitting diode includes an anode, an emission layer disposed on the anode and including a host, a phosphorescent dopant represented by Chemical Formula 1 and a fluorescent dopant represented by Chemical Formula 2, and a cathode disposed on the emission layer formed by mixing the fluorescent dopant with the phosphorescent dopant bonded to an acceptor at a specific site, thereby energy loss during an emission process can be minimized and energy transfer efficiency can be improved, and an organic light emitting diode with improved luminous efficiency and an organic light emitting display device having the same can be provided.